That’s a half truth
The biggest income is commercial, commercial includes; sponsorship, Retail, Merchandising, Apparel & Product Licensing.
Second biggest is usually broadcast
Third is match day revenue
So I would not say it means nothing, it just means less than 15 years ago. 15 years ago it often made up about 30-50% (United was 40ish percent) of revenue, today it’s down to 10-20%. So while it’s true match day means less and less, largely due to globalisation, I would not say it’s doesn’t contributes, especially for less global and more regional brands.
Inter have huge issues on all fronts. It’s not just on the sponsorship side, as Inter simply don’t generate enough on Retail, Merchandising, Apparel & Product Licensing either. Broadcast is a laughing stock in Italy, but isn’t really of Inters making and little they can do to change this.
Inter is never going to get much out of broadcasting its just the truth of being located in the “wrong” country.
Italian teams also don’t have the same international appeal and it shows in Sponsor deal, Merchandising, Apparel & Product Licensing. While this can be improved on, it will be on a very very long horizon. Requires tremendous amount of work, as Inter does not have the necessary global appeal currently.